| G | SK | SECTION G — PHYSICS |
| G01 | USK | INSTRUMENTS |
| G01 | KL | MEASURING (counting G06M); TESTING |
| G02 | KL | OPTICS (making optical elements or apparatus B24B, B29D 11/00, C03, or other appropriate subclasses or classes; materials per se, see the relevant places, e.g. C03B, C03C) |
| G03 | KL | PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY (reproduction of pictures or patterns by scanning and converting into electrical signals H04N) [4] |
| G04 | KL | HOROLOGY |
| G05 | KL | CONTROLLING; REGULATING |
| G06 | KL | COMPUTING; CALCULATING; COUNTING (score computers for games A63B 71/06, A63D 15/20, A63F 1/18; combinations of writing implements with computing devices B43K 29/08) |
| G07 | KL | CHECKING-DEVICES |
| G08 | KL | SIGNALLING (indicating or display devices per seG09F; transmission of pictures H04N) |
| G09 | KL | EDUCATING; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS |
| G10 | KL | MUSICAL INSTRUMENTS; ACOUSTICS |
| G11 | KL | INFORMATION STORAGE |
| G12 | KL | INSTRUMENT DETAILS |
| G21 | USK | NUCLEONICS |
| G21 | KL | NUCLEAR PHYSICS; NUCLEAR ENGINEERING |
| G99 | KL | SUBJECT MATTER NOT OTHERWISE PROVIDED FOR IN THIS SECTION [2006.01] |